Bandcutter sharpening machine



Jan. l, 1952 J. HEXTER ET AL BAND CUTTER SHARPENING MACHINE 4 Sheets-Sheet l Filed Feb. 4, 1949 J. HEXTER ET AL BAND CUTTER SHARPENING MACHINE `Jan. l, 1952 4 Sheets-Sheet 2 Filed Feb. 4, 1949 Jam 1, 1952 J. HEXTER ET AL 2,580,778

BAND CUTTER SHARPENING MACHINE Fied Feb. 4, 1949 4 Sheets-Sheet 3 my; mi

JMIUM Il INVENToRs Jose/z fla/rief' By fl/[am I [ankam Jan. l, 1952 J. HExTl-:R ET AL BAND CUTTER SHARPENING MACHINE 4 Sheets-Sheet 4 Filed Feb. 4, 1949 A INVENToRs fose Haier By //I'rzm ff [cz/:Mdm

Il Q\\\ SQ Rmill|||llll||lll -l ifm @rfb NN. l l l Y E w o N NN Patented Jan. 1, 1952 `UNms-o STATES PATENT oFFlcr-;

BANDCU'ITER SHARPENING` MACHINE yJoseph HeXter.and...William.E. Lanham, Atlanta, Ga., *assig'nofrs 'to "Columbia Baking Company, Atlanta; Gral,y a corporationofI Delaware` .Application February 4, 1949, Serial No. 74,524

.14` elaine. (Gis1- 38) Y 1 4:' Ihs invention relatesUY to a band uttersharpeningmachine and more particularlyftoe ma- .,hine Of; the kind` speciedwhieh is adapted to vautomatically index a band'cutter past asharpening station in timed relationto the movement of. reciprocating sharpening tools.

Itis, an object vof r`the invention touprovideI a -eband cuttersharpening machine having therein abandcuttencourse, whichl is adjustable to the 1ength and.. pitch ofc the cuttenon kv/ hich the sharpening operation isbeing performed.

-It is avfurther object to provide a `band cutter sharpen-ing. machine having therein a. pair of reciprocating.. sharpening. tools which are operafgtive. along the course. oi a band-cutter,andvhich are accurately and readily adjustable with, re- 'spect to theiroperating course.

Further important objectives .Y and advantages ofi the machinevvillappear fromareading of the followingspecilcation in light ofthe drawings -forming apart. hereof; .in which drawings:

llig. l isa planvew oifthe band cutterfsharpening machine;

f Fig. 2. is. a ,sideY elevational view;

lilieig. .3. Visa-.transverse. crossfsectonal view on line 3'-3 of Fig. 1;. and

Fig.- 4.is a...transverse .crossfsectional viewon line 4--4 of. Fig. 1.

The band cutter sharpeningmachine.herein ...embodies a Vframe member I0, on which are .mounted for rotation a plurality ofguide. sheaves {2 .and- I4 arrangedin a planeto turn about axes f disposed perpendicularly to the-.planeko fv the .fisheaves. The-sheaves IZand` I4, togetherwith othengguiding devices to be referred to, herein- 1eaf ter.constitute a cutter guide course forsuprer-innen band-eener |6 Opereiingmeeheniein .is s seeiniedvwiih ene ef.. ih e .eheeveeheren Sne- -ei nelly v:the:ehenve. i4, f erirnnerting neriedie *indexing movement ythereto.. ior theV purposejko, 40

edi/encina the bend entier ,iii eeeteneiiei grindinewheele. I8. .end .20 'I iie grinding. Wheel-e fiend 2.0. nreneeiiiened. elena ineaeuiieii einde Y eeinse sier-contact with a bandeutter thereor'i.- Means inni, be. desinnee neieinbeiow. `More speoally, fthe .bandcuttercourse. in- `c 1udes,y.in addition. to. .themain sheaves li2 and beni wiiiehihe ennd'eniieri ii, iS. trained', 'ine idle sheaves 24 and 2l be'ingl lo cated,f respectively:at .:lihe entier. grinding Zeneegin which ine grinding ,Wheels I8 and 2).have their effective operation? 2 Analedlior; rotation. in suitable bearings carried emhenecnne name nu The ineexingnea'vie i4 `is rotated periodically inis'tep-by-steprn'` ment forthe purpose'ofadvancing theband u tr5 ter le tneqist'ance'of a tooth ateaeh step. Trie mechanism for. imparting thehstep-,by-l-step rota- '.iien-ie ine'indeXine Shenve i4. will ,new l nedeleeribed- A i Mountedin the machine; frame vI 0 `isa geared 1 0 motprse having@ s haft'azgxteneipg therefrom,

nie shan. e2 beingrcinposeein@ diieenen ri'ri.- -.1 e1, ienne. longitudinal eenie'r line ef the nieeifine- Fixed te the Shaft {i2-.ien C hainepieeiei i nenni which is trained e, spreelei-ennin35 Depeeed .15 fin'. Substantially. nerniiel ielniien in ilie meier snn fi 32 iefe Shaft .38.i te. Whieh ie fined. n' chain spreekei driven by the Snreekeiehnin 1.1.6, the ,ehainbeing trained aboutan idle sprockettl. The hub. 0f the. sproekeiii hele f eirneill in ene gage withcorresponding clutch teeth on aslid- `v-` ing clutch member, vvl'iichis splined to the shaft3 8. .When an operating memberuds moved .-laterally. it. effectively .moves the. elnieh- 25 ing. collar 4 4 into clutching engaeemenewiih .the

.teeth 42, 0n the sprneket 'thereby Conditioning .fthefshnft 38 forrotation under the. infliieneefef the sprocket. chain; V3 6. Y

lixedforrotation with theshaft 33 is a rotary TJcamgillwhich lies in contactvvith aoam follower on an indexing lever .58, theindexing leverbeing .mounted fgorswinging movement at itslower end on a bracket 52 which extends laterally fromthe v frame of the machine. yThe upperend,ofthe in A35 dexing leverv 50 has an operative connectionjvith .an index plate rod 54, the connectionherein being i shown 'as aslot andipiniuconnection. The., lever -50has alaterallvprojecting pin 5B which extends intoa slot 5,3 at the end of the lindexing plate rod. 54. --f An adjusting screw 68 is provided at the Yend of thejndexing plate rod 54 for the purpose offdeterminng-.theposition of the .pm lpinx-the slot 58.

Oneeend, Vof the frame-IDA carries a bracket62in r imparting timedjreoiprocating'.movementftoirwnwhich.is.;ournaled.for rotation a shaft 64,;@the

grinding Wheels IB and p20 has beenvprovided,

f shaftbeing vertically adjustablebyI manipula- -iton of a bearing screw- 66. |The bearngscrew 66 is carried by a supporting bracketwhich exl tends under Vthexlnzver end of .the/shaft 64. i Mennied en ine, Snnfi. 64; fen f reeieiniien with respect theretonis anindeXing gear 10 andunderlyiilllle gear. 'm vfor rotation'withrespecttd the .shaft 4fisanindezxing plate-'12'. One endff the Vind ing' Plate extendsjbeyond the peripheryjof enneineeeeieeeennine eneeyesljeielieeefe5.. ineineeiii'ne eeeriiiiendin ine exieneineeiie thereof is a pivot pin 13 which receives and rotatably secures the inner end of the indexing plate rod 54. Swingably mounted on the pin 13 is a spring biased ratchet tooth 14. The mechanism described is effective to transmit motion from the indexing lever 50, through the index plate rod 54, to the indexing plate 12, the pawl 14, and the indexing gear 10. In one direction of movement the pawl 14 carried on the extending end of the indexing plate 12 will engage the teeth of the indexing gear and advance such gear through the distance of a single tooth.

In order that the indexing plate 12 may be swung in the opposite direction without the pawl 14 having a rotative effect on the indexing gear 10, a detent mechanism operative on the teeth of the indexing gear 10 has been provided. Accordingly, there is aflixed to the frame a detent housing 16, in which is mounted a detent 18 for sliding movement against the tension of a spring 80. The spring 80 at its outer end bears against the end wall of the housing 16 and at its inner end it bears against a shoulder 82 formed on the detent. The inner end of the detent is in radial alignment with the teeth of the indexing gear 10 and its free inner end is so shaped as to lie between adjacent teeth of the gear for holding the gear against rotative movement when the detent and the teeth are in engagement. The outer end of the detent has formed thereon a head. With the head is engaged the upper free end of a detent operating bar 84, the lower end thereof being pivoted in the bracket 52. The shaft 38 carries a cam 86 which lies in contact with a cam follower on the detent operating bar 84. Asal consequence, the rotation of the shaft 38 will also be eiective through the cam 86, the detent operating bar 84 and the detent 18 to release the indexing gear 10 for rotation. The shape and position of the cams 48 and 86 are such as to relate the movement of the indexing device and the detent device, respectively, this relation being such that when the detent 18 is withdrawn from contact with the indexing gear 10, the indexing plate 12 through its connecting instrumentalities will rotate the indexing gear 10 through the distance of a single tooth. At the end of the gear rotation the detent cam again permits projection of the detent 18 into gear holding position under the influence of the spring 80. Springs 19 and 8| retain the levers 50 and 84 in constant contact with their respective operating cams.

VRotative motion is transmitted from the indexing gear 10 to the indexing sheave |4 through an adjustable connection, which includes a stud 88 rotatably carried by the upper face of the indexing gear 10 and extending therefrom to a point above the indexing sheave |4. The stud 88 is suitably threaded for the reception of an adjusting screw 90. The adjusting screw 90 threadedly engages a stud 92 extending upwardly from the upper face of the indexing sheave I4. The stud 92 is rotatably mounted in a spoke of the indexing sheave |'4 so that the position of its screw threaded passage may be maintained in alignment with the adjusting screw I9 throughout any given range of adjustment.

g The sheave I2. which constitutes one of the main elements of the band cutter course, is journaled for rotation in a block 94. The block 94 is slidably mounted in a guideway bracket 96 extending outwardly from an end of the frame |0, the same being positioned at substantially the center line of the frame structure. The sliding block 04 may be longitudinally adjusted by rotation of an adjusting wheel 90, thereby increasing or decreasing the length of the band cutter course and consequently accommodating the machine to band cutters of various lengths.

The frame |0 includes a plurality of transverse bed members |00 on the upper face of which is carried a pair of longitudinal rails |02. The rails |02 are adapted to carry a grinding tool carriage structure |04. The carriage structure consists 'of a pluality of longitudinal rails |06 which are supported on transverse tie rods` |08. The tie rods |08 project laterally beyond each side of the carriage structure to constitute axles which rotatably mount iianged wheels ||0 for supporting the carriage structure on the bed rails |02. Supported on the longitudinal rails of the carriage structure are a pair of oppositely disposed motor mountings ||2, each of which constitutes a frame designed to slidably receive a motor mounting plate ||4. To the plate ||4 is pivoted one end of a motor base ||6, the pivot structure on each mounting plate being at the outer end thereof and consisting of a pair of ears ||8.ex tending upwardly from the plate and receiving between them on a pivot pin the reduced throat of the motor base |'|6. The opposite end of the motor base is supported by an adjusting screw |20. It follows, therefore, that the motor mounting plate |4 may be readily adjusted in a lateral direction by manipulating an adjusting screw |22, and the motor base ||6 may be tilted towards or away from the band cutter course by adjusting the screws |20 at the free end thereof.

Attached to each motor base ||6 are grinding tool driving motors |24 and |26, having fixed to their shafts the before mentioned grinding wheels I8 and 20, respectively.

As hereinbefore noted, the grinding tool carriage |04 is adapted to be reciprocated in timed relation to the indexing movement of the indexing sheave |4. Accordingly, mechanism has been provided for reciprocating the grinding tool carriage including the grinding wheels |8 and 20 past the grinding zones of the band cutter course after each indexing movement of the indexing sheave I4. Specifically, the mechanism consists in adriving sprocket |28 xed for rotation to the motor shaft 32. The sprocket |28 is adapted to drive a sprocket chain |30 which is in engagement with a free running drive sprocket |32 mounted for rotation on a longitudinally disposed shaft |34. The hub of the sprocket |32 has formed therein a clutch face adapted to engage with a confronting face of a shaft carried clutch mechanism |36. The confronting clutch faces may be placed into operative position through manipulation of -a clutch operatingL lever |38. When the confronting faces of the sprocket |32 and the clutch device |36 are in engagement, the parts are conditioned to permit the sprocket chain |30 to impart rotational movement to the longitudinal shaft |34. At one end of the shaft |34 is keyed a beveled gear |40, which in turn constantly meshes with a beveled gear |42 carried at one end of a transverse shaft |44. The opposite end of the transverse shaft |44 has fixed thereto a sprocket |48, which engages a sprocket chain |48. The sprocket chain |48 in turn engages a sprocket |50 attached to one end of the transverse carriage drive shaft |52. To the opposite end of the carriage drive shaft |52 is attached a crank plate |54. Eccentrically connected tothe crank 5 plateV |54 is one end of a pitman |56, the other end of the pitman havinganoperative connection with an oscillating shaft |58. The ends of "theV oscillating` shaft |581 are'Vv journaled inv bear- In use of the machine a band cutter is trained .,overfthe, indexing sheave I4, about 'the idle Isheaves"22,215,26 and* 2S," and about the' sheave 1|2. The blade'is'A then`put under the desired tension by manipulating'the adjustingr wheel 9|?,Y which"` movesthe` axisY of4 the lidleV sheave vI2 in a. "longitudinaldirection. "A gauge or pointer |60 "'isjprovided for'the purposeof assisting Vin'posi- "tioning the'blade-forthe desired pitch and scal- Llop, 'andltolindicate whether the hollow ground n scallop of" the' blade-will -meet" the facel of the grinding stones I8 and 20 on the right radius.

Should it be necessary to adjust the plane of the blade in the grinding course and particularly for the purpose of adjusting the pitch of the scallop, no matter how slight, to compensate for elongation of the blade due to use or repeated regrinding, it is necessary merely to adjust the screw 66 which bears on the end of the indexing sheave shaft 64 and thereby raise or lower the shaft and the indexing sheave I4. This operation is effective for the reason that the peripheral rim of the sheave against which the cutter rests is slightly tapered from bottom to top, and consequently, a slight adjustment with respect to the plane of the course will result in the necessary arrangement of the cutter in relation to the grinding tools at the grinding zones.

After the cutter has been positioned and adjusted in its course the machine is conditioned for a continuous grinding operation with respect to the cutter, and such operation may proceed unless for some reason the grinding wheels |8 and 20 require adjustment with respect to the grinding zone of the course. Should an adjustment be necessary, the grinding wheels may be laterally adjusted towards and away from the sides of the cutter by turning the adjusting screws |22. Furthermore, should the elevation of the grinding wheels require adjustment, such adjustment may be achieved by turning the screws |20 and thereby pivoting the motor base IIB in the supporting ears |I8.

Assuming all adjustments to have been made, it remains only to energize the motors 30, |24 and |26 to set the machine in operation. Once the grinding operation has been started under properly adjusted conditions, the machine operation thereafter is continuous and automatic. As herein described, operation of the motor 3S will effectively drive the shaft 28 when the clutch 44 has been moved into contact with the clutch teeth 42 on the drive pinion. The cams 48 and 8B rotate in unison with the shaft 38, and consequently, the indexing and detent mechanisms are operative without further attention. The cam 86 will operate to withdraw the detent 'I8 from contact with the teeth on the indexing gear 'IU and as soon as the gear has been released, the cam 48 will be in such position as to reciprocate the indexing plate l2 through one position. Upon rotation o f the indexing gear li! and consequently the indexing sheave I8 through f6 lvthe.:r cutter 1' .icourse;,:fandfz this, ::briey, is raccom- .1 plished i, vthrough fthe; drive t; shafts I 3.4 and.; 4,4, the '.sprocket; chain |146 and the shaft |52.. :It has; heretofore.l been pointed: out thatitheigpitman I 56interconnecting thefcrank; plate I 54aandithe carriage shaft |58fi-eifectively reciprocatesgzthe grinding tool `carriage-,along the :tracks'zIOZ constantly whilerpower; isapplied to; rotategthe shaft |34. The rrelation lofzzthe :carriageymovement and theaindexingfmechanism is such thatzgpthe `indexing device operatesitw-ice: forieach, revoluy,tion of-.thezcrankfrplate |54. Since-thesa-parts Voperate in unison and..initimedizrelationsitxwill appear `that `each section of` the a cutterpassi-ng through the grinding stations is subjectedztmthe same degree'oftreatmentlby the grinding wheels I8 and320, andthatzathe proper grinding of a complete band cutter is entirely automatic once the operation has been initiated. It follows also that since each section of the cutter is subjected to the same degree of grinding, a uniform grinding follows, with the result that the cutter is equally sharp and Well ground throughout its entire length.

The invention has been illustrated with respect to a single form in which it is presently embodied in operative form, but this form has been used for the purpose of illustration only. Changes and modifications may be made in the machine without departing from the spirit of the claims that follow.

We claim: g

1. In a band cutter sharpening machine, a plurality of guide sheaves arranged in a plane to turn about axes disposed perpendicular to the plane of the sheaves constituting a cutter guide course for supporting a band cutter, means associated with one of said sheaves for imparting periodic indexing movement thereto, means for adjusting one of said sheaves in a radial direction within the plane of the course for adjusting the length of said course to accommodate the same to band cutters of different lengths, a driven grinding wheel disposed at each side of said course, and common means for imparting a straight line reciprocating movement to said grinding wheels.

2. In a band cutter sharpening machine, a plurality of guide sheaves arranged in a plane to turn about axes disposed perpendicular to the plane of the sheaves constituting a cutter guide course for supporting a band cutter, means for adjusting one of said sheaves in said course in an axial direction, means associated with one of said sheaves for imparting periodic indexing movement thereto, a driven grinding wheel disposed at each side of said course, and common means for imparting a straight line reciprocating movement to said grinding wheels.

3. In a band cutter sharpening machine, a plurality of guiding sheaves arranged in a plane to turn about axes disposed perpendicular to the plane of the sheaves constituting a cutter guide course for supporting a band cutter, means as- 65 sociated with one of said sheaves for imparting periodic indexing movement thereto, a pair of grinding wheels mounted on a common carriage, means for supporting and guiding said carriage in a straight line along a part of said cutter guide 70 course, said wheels being disposed at opposite sides of said course, and common means for im parting a reciprocating movement to said carriage.

4. In a band cutter sharpening machine, a 75 plurality of guide sheaves arranged in a plane to turn about axes disposed perpendicular to the plane of the sheaves constituting a cutter guide course for supporting a band cutter, one of said sheaves being mounted for periodic indexing movement, driven grinding Wheels disposed at opposite sides of said course, a common carriage for supporting said wheels, means supporting said carriage for straight line movement along said cutter course means for adjusting said wheels in a radial direction on said carriage, means for tilting said wheels on said carriage, and common means for reciprocating said carriage along said cutter course and for imparting periodic indexing movement to said sheave.

JOSEPH HEXTER.

WILLIAM E. LANHAM.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 1,049,412 Sheehan Jan. 7, 1913 r 2,002,812 Hansen May 28, 1935 2,082,832 Hansen June 8, 1937 2,118,197 Hartman May 24, 1938 2,183,995 Mautz Dec. 19, 1939 2,203,530 Kasch June 4,V 1940 2,252,879 Calame Aug. 19, 1941 2,252,892 Kottmann Aug. 19, 1941 2,265,600 Hartman Dec. 9, 1941 

